Hydraulic Block for a Hydraulic Power Unit of a Hydraulic Vehicle Brake System

Abstract

A hydraulic block for a hydraulic power unit of a hydraulic vehicle brake system includes a main brake cylinder bore and an intake that are integrated to form a pedal travel simulator.

Description

PRIOR ART[0001]The invention relates to a hydraulic block for a hydraulic power unit of a slip-controlled hydraulic vehicle brake system having the features of the pre-characterizing clause of claim 1.Prior Art[0002]Hydraulic blocks are known. These are typically low-profile cuboidal metal blocks for the installation of hydraulic components, such as hydraulic pumps, solenoid valves, hydraulic accumulators and damper chambers of a slip-controlled vehicle brake system. The hydraulic blocks hold the hydraulic components mechanically and connect them hydraulically, typically by means of bored connecting lines. A hydraulic block fitted with the hydraulic components forms a hydraulic power unit and is the heart of the slip control system. Low profile is intended to mean that hydraulic blocks often have a thickness which is approximately one quarter to one third and seldom more than half the length and width. In plan view, the hydraulic blocks are rectangular and are often almost square. N...

AI Technical Summary

Benefits of technology

[0009]One advantage of the invention is compact and space-saving accommodation both of a brake master cylinder and of a pedal travel simulator in the hydraulic block of a hydraulic power units of a hydraulic vehicle brake system. A separate brake master cylinder is superfluous. Although a brake booster, in particular a conventional vacuum brake booster, is possible in principle, it is not provided. Hydraulic brake boosting or self energizing wheel brakes is / are preferred if brake boosting is desired. It is thereby possible to eliminate the installation space for a vacuum brake booster.

[0010]The dependent claims relate to advantageous embodiments and developments of the invention specified in claim 1.

[0011]Claim 2 provides two receptacles for two pedal travel simulators, which are connected hydraulically in parallel, for example. It is also possible, for example, to connect each of the two pedal travel simulators to a brake circuit of a dual circuit vehicle brake system. Through different diameters, piston strokes and / or simulator spring hardnesses, for example, the two pedal travel simulators allow a brake pedal characteristic which changes over a pedal travel, i.e. a change in a force / displacement ratio of a piston of the brake master cylinder over the travel thereof. Another advantage of two pedal travel simulators instead of one is space-saving accommodation: a volume divided into two pedal travel simulators can be accommodated in a flatter hydraulic block than is the case with one pedal travel simulator.

[0012]As regards compactness, accommodation in a hydraulic block and boring of the hydraulic block to connect hydraulic components, arrangement of the receptacle or receptacles for the pedal travel simulator or simulators on a transverse side of the hydraulic block and / or of the brake master cylinder bore parallel to and close to an opposite transverse side of the hydraulic block has proven (claims 3 to 5). One embodiment of the invention provides a cylinder bore for a piston pump in a flat side of the hydraulic block (claim 5). The cylinder bore can be provided centrally, i.e. in or close to a center of the flat side. Making the cylinder bore in a flat side instead of a longitudinal or transverse side makes possible a larger piston diameter and coaxial mounting of an electric motor for driving the piston pump.

[0013]Claim 7 provides an oblique bore for connecting two receptacles for solenoid valves in the hydraulic block. “Oblique” refers to an angle which is not a right angle relative to at least one outer side of the hydraulic block, the oblique bore as it were departing from the Cartesian system of connecting lines, receptacles etc bored in the hydraulic block parallel to and / or at right angles to the sides and to one another. An imaginary extension of the oblique bore passes through a mouth of one of the two receptacles for solenoid valves, which the oblique bore connects. As a result, the oblique bore can be formed by one of the two receptacles and does not have to be bored outside a receptacle or the like in one of the sides of the hydraulic block and then resealed in a pressure tight manner.

[0014]Claim 8 provides three rows of receptacles for solenoid valves of a slip control system in a hydraulic vehicle brake system on a flat side of the hydraulic block. In particular, the receptacles for the solenoid valves are provided on a flat side of the hydraulic block which lies opposite the flat side of the hydraulic block which has the cylinder bore for the piston pump of the hydraulic vehicle brake system. For example, brake pressure buildup valves are arranged in one row, brake pressure reduction valves are arranged in another row, and further valves, such as isolating valves and / or intake valves, are arranged in yet another row in / on the hydraulic block, e.g. the brake pressure buildup valves are arranged in a first row, the brake pressure reduction valves in a second row and the further valves in a third row of the hydraulic block. One or more receptacles for one or more further solenoid valves can be provided in an additional row between the other rows (which would change the counting sequence thereof) or preferably as a fourth row (or, alternatively, as a first row, in which case the row number of the other rows increases by one) outside the three rows on the flat side of the hydraulic block. Apart from the receptacle for further solenoid valves, such an additional row can also have one or more receptacles for pressure sensors. This gives a hydraulic block with, for example, four or five rows of receptacles for solenoid valves and / or pressure sensors. For example, a first row has one or more receptacles for one or more pressure sensors, a second to fourth row has receptacles for solenoid valves, in particular a second row of receptacles for brake pressure buildup valves, a third row has receptacles for brake pressure reduction valves and a fourth row has receptacles for further solenoid valves, such as isolating valves and / or intake valves, and a fifth row has one or more receptacles for further valves and / or pressure sensors.

Problems solved by technology

Although a brake booster, in particular a conventional vacuum brake booster, is possible in principle, it is not provided.

Images